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#ifndef SKY_ENGINE_PLATFORM_TEXT_TEXTRUNITERATOR_H_
#define SKY_ENGINE_PLATFORM_TEXT_TEXTRUNITERATOR_H_

#include "flutter/sky/engine/platform/text/TextRun.h"

namespace blink {

class TextRunIterator {
 public:
  TextRunIterator() : m_textRun(0), m_offset(0) {}

  TextRunIterator(const TextRun* textRun, unsigned offset)
      : m_textRun(textRun), m_offset(offset) {}

  TextRunIterator(const TextRunIterator& other)
      : m_textRun(other.m_textRun), m_offset(other.m_offset) {}

  unsigned offset() const { return m_offset; }
  void increment() { m_offset++; }
  bool atEnd() const { return !m_textRun || m_offset >= m_textRun->length(); }
  UChar current() const { return (*m_textRun)[m_offset]; }
  WTF::Unicode::Direction direction() const {
    return atEnd() ? WTF::Unicode::OtherNeutral
                   : WTF::Unicode::direction(current());
  }
  bool atParagraphSeparator() const { return current() == '\n'; }

  bool operator==(const TextRunIterator& other) {
    return m_offset == other.m_offset && m_textRun == other.m_textRun;
  }

  bool operator!=(const TextRunIterator& other) { return !operator==(other); }

 private:
  const TextRun* m_textRun;
  int m_offset;
};

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_TEXT_TEXTRUNITERATOR_H_
